@book { LesonnetdePtrarqueBaudelaire,
    title = "Le sonnet de Pétrarque à Baudelaire",
    subtitle = "Modes et modulations",
    author = " {Board of Trustees of the University}",
    year = "1989",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1073852"
}